proc SPF_dns_cache_new(layer_below: SPF_dns_server_t; name: cstring;
                       debug: cint; cache_bits: cint): SPF_dns_server_t {.
    importc, header: "spf.h", ...raises: [], tags: [], forbids: [].}

proc SPF_dns_cache_set_ttl(spf_dns_server: SPF_dns_server_t; min_ttl: time_t;
                           err_ttl: time_t; txt_ttl: time_t; rdns_ttl: time_t) {.
    importc, header: "spf.h", ...raises: [], tags: [], forbids: [].}

proc SPF_dns_set_conserve_cache(spf_dns_server: SPF_dns_server_t;
                                conserve_cache: cint) {.importc,
    header: "spf.h", ...raises: [], tags: [], forbids: [].}